If you’re interested in physical fitness, you’ve probably heard of the ketogenic diet. It’s a diet where you eat lots of fat to encourage your body to burn even more fat. In this Purefit Keto review, we’ll be reviewing a supplement that helps your body to do that.
Here’s how the ketogenic diet works to begin with.
In our bodies’ normal metabolic state, we burn carbohydrates for energy. They’re our bodies’ favorite food. Just like a hungry kid will always choose a candy bar over a healthy meal, your body will burn carbs before anything else. The only way to change this is by removing carbs from your diet.
In that case, our bodies have a backup system called “ketosis”. When your body is in ketosis, your liver is converting dietary fat into fatty acids called “ketones”. The idea behind the ketogenic diet is that by training your body to burn fat instead of carbs, you’ll burn more body fat than you otherwise would.
The ketogenic diet is also used to treat epilepsy. For whatever reason – scientists aren’t sure why – the brain cells that misfire in an epileptic seizure function normally when your body feeds them ketones instead of carbohydrates.
Let’s take a look at what Purefit Keto does to help.

What is Purefit Keto?
Purefit Keto is a dietary supplement that comes in a 30-capsule jar, which is a 30-day supply. Each capsule supplies 800mg of exogenous ketones, including Calcium BHB, Sodium BHB, and Magnesium BHB.

We’ll take a closer look at the ingredients in a minute. For now, let’s focus on what Purefit claims to do.
To begin with, they claim that their supplement will trigger ketosis quickly when you take it. The idea here is to give your body a big dose of ketones to kick start your liver, while providing you with an immediate energy boost. This quick boost is particularly helpful for getting into ketosis in the first place, which is why a lot of ketogenic diet guides recommend taking exogenous ketones when you’re first getting started.
They also claim that Purefit Keto is a unique, proprietary formula that’s a technological breakthrough, and that you can lose a pound of fat per day. This is not entirely accurate. While people often shed a few pounds of water weight when they’re starting a ketogenic diet, that only continues for a few days.
After that, a pound a day seems like an extremely high target unless you’re morbidly obese to begin with. We can prove this with basic math. A pound of human body fat contains 3,500 calories, while the average American adult burns about 2,000-2,500 calories per day.
Even if they literally starved themselves, most people wouldn’t lose a full pound of fat every day. Since you still need to eat food to get vitamins, minerals and protein, 1-2 pounds a week is more reasonable for most people.
Purefit has plenty of reason to claim that their product will help you lose weight. Most dieticians agree that ketones help with this. It’s just that the pound a day claim is really only true for people who are extremely obese or who get a lot of exercise.
Purefit Keto Ingredients
So what’s inside these little capsules? Let’s take a look at the label:
- Magnesium BHB, Calcium BHB, and Sodium BHB – We’ve already mentioned these, since they’re the active ingredients. BHB is short for Beta-Hydroxybutyrate, which is one of the three ketones that the body produces naturally when breaking down fats. The others are Acetone and Acetoacetate.
Acetone is unhealthy, is produced in small amounts, and is generally expelled through the lungs. Acetoacetate is produced in larger amounts, but isn’t as plentiful as BHB. As a matter of fact, your liver ultimately breaks it down into BHB before your body can use it. BHB is by far the most common ketone in the body.
So what’s with the Calcium, Magnesium and Sodium varieties? These are simply salts that attach to the ketone to help your body absorb it. Once they enter your blood stream, the salts separate from the ketones, and you end up raising your ketone and electrolyte levels.
Purefit’s claim of a “proprietary formula” probably refers to the mixture of Calcium, Magnesium and Sodium BHB rather than simply relying on one of them. There’s no evidence that mixing different varieties helps you burn more fat, so at most you may benefit from a better electrolyte balance.
- Magnesium stearate – This ingredient is just a filler. It’s biologically inert, so a lot of pharmaceutical and supplement companies add it to their pills for bulk. It doesn’t help the supplement work any better, but it doesn’t hurt anything, either.
- Rice flour – This is another filler, added for bulk. Just like Magnesium stearate, it’s a common additive in supplements. Rice flour is considered healthier than wheat flour because it’s gluten-free and higher in protein.
- Silicon dioxide – Silicon dioxide is an anti-clumping additive. Basically, it keeps the other ingredients from clumping up and losing effectiveness. It’s commonly used in pharmaceuticals and supplements, and is biologically inert.
- Gelatin – Gelatin is used to create the actual capsule. It’s easy to digest, and has no effect on the effectiveness of the product.
Basically, Purefit Keto breaks down like most supplements; a few active ingredients, some inert ingredients, and a capsule.
How Does Purefit Keto Work?

From the ingredients list, we can see that Purefit Keto provides a large quantity of BHB ketones attached to three different electrolytes. So what does that mean for people who are considering a ketogenic diet?
We’ve put it to the test, and it undeniably raises your blood ketone level. As we mentioned, it’s especially useful for getting into ketosis. However, it’s only as good as the rest of your diet. Just like you can’t eat McDonald’s every day and expect to stay healthy with a multivitamin, your entire diet needs to be ketogenic for you to get into ketosis.
That’s not to say that it has no benefits when taken on its own. Ketones do seem to help with mental sharpness, for example, even if you’re not in ketosis.
We didn’t want to limit ourselves to personal experience, so we read a lot of online reviews in fitness forums and other websites. Here’s what we found.
First, there were lots of people who lost weight by combining Purefit Keto with a ketogenic diet and exercise. A lot of people also said that it helped during the first few days, when “keto flu” can cause exhaustion, headaches and mental fog.
This makes sense. When you first go on a ketogenic diet, your liver takes a few days to ramp up ketone production, so you’re essentially starving. By taking exogenous ketones, you’re giving your body energy without feeding it any carbs and undermining your diet.
We also found that some people found it helpful for cheat days. Hey, nobody’s perfect, and going carb free is a difficult lifestyle. If you end up eating a slice of cake at an office party, taking some ketone pills can keep you from going out of ketosis for more than a few hours, and ease any symptoms of carb withdrawal.
Finally, it seemed like a lot of the negative reviews came from people who didn’t change their diet or exercise habits. It seemed like these people were expecting something like a prescription diet pill. This isn’t Purefit’s fault. In their instructions on their website, they specifically say that you need diet and exercise to lose weight.